Full Product Manual
Grace Construction Products
GRACE TRI-FLEX
®
High performance roong underlayment
Product Advantages
• Lighter and covers more area
• Stronger
• More durable
• Slip resistant under wet conditions
• Suitable for use under all major roof coverings
• Facilitates faster and easier
installation
• 25 Year Warranty
Grace Tri-Flex
®
mechanically-attached roong underlayment is
a high performance water-shedding underlayment, designed to
overcome the shortcomings of traditional roong felt. It is stron-
ger than #30 felt and withstands high wind conditions; it is lighter
than #30 felt and covers more area. The product is mechanically
attached to the roof and can be used alone or in conjunction with
Grace self-adhered underlayments.
Grace roong underlayment provides a stable base for the appli-
cation of mechanically-attached roof coverings and serves as a
secondary water shed to help prevent leaks if water penetrates the
primary roof covering. The product may also be used to tempo-
rarily “dry in” the
structure for a period of 6 months before the roof construction is
nished or if the primary roof coverings become damaged.
Grace underlayment is suitable for application as part of all major
roof systems.
Product Description
Grace underlayment is a high strength woven synthetic roong
underlayment coated with a layer of UV stabilized polyolen.
This composition creates a tough, weather-resistant membrane
that has been proven under some of the harshest conditions in
North America.
Grace Tri-Flex
®
roong underlayment is available in 10 sq rolls
(48 in. wide x 250 ft long).
Features & Benets
Below are some of the major benets of Grace roong underlay-
ment compared to conventional #30 roong felt:
It’s lighter and covers more area—A roll of underlayment is
around half the weight of #30 felt, and has nearly 5 times the
coverage.
It’s stronger—Grace Tri-Flex
®
roong underlayment is 20 times
stronger than felt and won’t tear away from nails even in high
winds.
It’s more durable—Grace underlayment can be left
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